superstorm sandy was, you know, sort of case in point, an example of that. >> why is this happening? is there anything that we can do to reverse it? >> there's nothing we can do to reverse it. at this point the consensus is very, very clear. the warming is being caused by fossil fuel pollution, carbon dioxide emissions that is burning of coal, burning of oil, burning of natural gas. that carbon pollution, those greenhouse gases are the primary contributor to this warming and the warming that is projected is baked into the atmosphere at this point. it's not good news. >> if people want to read more, where can they find out more about this? >> well, i cover it regularly at nationaljournal.com. i've got a lot of coverage of all of the latest findings and real world impacts of what they mean. >> coral davenport, thank you for being here this morning. >> sure. thanks for having me. >>> we're about to wrap this hour of "weekends with alex witt." thank you for joining me. but straight ahead, more smart political talk with "up with chris hayes" and then "melissa harris-perry." i'm t.j. holme